Head-block for saw- m ills



' (No M0881.) s sheets-'sheen 1. I. SWANK.

HEAD BLOGKFOR SAW MILLS.

No. 888,600. y Patented May 29, 1888.

.l LI

ATTORNEYS.

N. PETERS, Pmwuumguph", wnmugm. n.6.

(N0 Model.) `3 Sheets-,Sheet 2.

I. SWANK.

HEAD BLOCK P0P. SAW MILLS.

No. 383,600. Patented May 29, l1888.

WLrNLssLs:` LNVLNTOR:

@5% BY my Q ATTORNEYS.

N. PETERS. Pnuwmnognpmr. wifhingan. n c.

(No Model.) 3 Sheets-Sheet 3.

I. SWANK.

.HEAD BLOCK POR SAW MILLS.

No'. 383,600. PatentedlVIay 29, 1888.

ATTORNEYS.

`N, PETERS, Phowmhognphm, washingmn, D. C.

Unire STATES tries.

HEAD-'BLOCK FOR SAW-MILLS.

SPECIFICATION forming part of Letters Patent N. 383,600,dated May 29, 1888.

Application Iiled December 1G, 1887. Serial No. 258,048. `(No model.)

To @ZZ whom, it may concern:

Be it known that I, IRWIN SwANInofParis,

in the county of Edgar and State of Illinois,

corresponding parts in all the igures.

Figure l isaplan view of both ends of a saw-1nill carriage with similariy-constructed head-bloeks thereon,the intermediate portion ofthe carriage being broken away. Fig. 2 is a vertical cross-section on line rc x, Fig. l Fig. 3 is a vertical longitudinalseetion on liney y, Fig. 1,the View being taken in the direction of the arrow 1l. Fig. 4 is a side elevation of Fig. l. Fig. 5 is an inverted plan view ofthe under side of one ofthe traveler-knees. Fig. 6 is a plan view of the pawlcarrying and kneeactuating blocks; and Figs. 7 and 8 are horizontal sections on line z z, Fig. 2,with certain parts shown in different positions, to be hereinafter particularly referred to.

In the drawings, A A represent the longitudinal head-block beams or portions of a sawmill carriage at each end thereof, across and upon which rest the transverse head-block rails B, secured thereto, upon which the knee C travels. Theknee on its under side and below the railB is provided with two angularl yarranged cam-grooves, a a, which in the present instance are shown as 'formed by and between the edges of the triangular block b and the obliquely-arranged blocks or strips d ci'.

Below the line of travel ot' the knee is a rocker or oscillating bar, D, having a longitudinal toothed rack, f, on its upper edge, said rocker-bar being suitably journaled in bearings g of the head-block frame A, and provided at one journal witha crank-arm, g2, its upper end being slotted, as at g3, with which slot engages a pin, g4, of aconnectingrod, g5,

suitably guided, to the outer end of which connecting-bar is hung a link,g, which, by its other end, is pivoted to an intermediate portion ot' a lever, gl, pivoted to the frame, as at g8.

Upon and embracing the rocker-bar D are two separate blocks, E E, provided with up wardly-eXtending tongues lz 7L, angularly arranged thereon in relation to each other and to the cam-slots a a in the traveling knee for an engagement with said cainslots, and below said tongue the said blocks are slotted, as at k, within which slots are suitably disposed and pivoted double-nosed pawlsjj, adapted for engagement by their either ends, as desired,with the rack on the rocker-bar. These pawls, as shown, are formed with a forward curved shorter end, js, and longer rearward weighted end,ji, so they will rest with their rearward noses in the racks; but by means of a tilting bar, F, peculiarly formed in crossseetion and ranging above the curved ends of said pawls, they may be made to stand so that neither end thereof will engage the rack, or, when desired, in a manner to throw their forward noses, js, instead of their rearward noses, jt, into engagement with the rack. This tilting bar F for each head-block extends longitudinally above and parallal with the rockershaft D, and is pivotaly hung in ear-piecesl thereof, being provided with a crank'arm, m, which, by link m2, is connected with a lever, m3, pivoted on the frame A, whereby on a proper throw of said lever mi' the bar F may be tilted to a proper relation with or bearing on the pawls, to secure the engagement by their either end, as desired,with the rack, or to so swing them that neither end will be in engagement.

As seen in Fig. 5, the wedge-shaped block b on the under side of the knee is adjustably secured thereon by the headed screws b3, passing through slots bZ in the block, whereby compensation may be made for any wear of the edges of the cani-grooves.

A suitably-graduated scale, p, is placed on one of the side 'beams of the head-block frame A, and anv index-pointer, p2, is arranged and suitably guided in relation thereto, and is moved accordingly as the knee travels, being connected to the knee by a wire rope or other iiexible connection, p3, and a spring, p, or weight, being suitably applied, will draw the index back as the knee retraces. When it is in the position shown in Figs. 1, 2, and 7, and it is desired to secure a travel of the knee across the head-blockin the direction of the arrow 2, the pawlsjj are set for engagement by their rear ends, j, (see Fig. 2,) the oscillating shaft D is so tilted as to placethe tongues at the end portions of the cam-grooves a ot, as shown in Figs. 4 and 7, and the lever g7- is swung in direction of the arrow 3, Fig. 4, whereupon said bar D will be 'tilted in the direction of the arrow 4a, Figs. 4 and 7, and the tongues h of the rearmost block, E, (i. e., rearmost as tothe desired line of travel,) will act upon the edge a2 of the wedge-piece b, forcing the knee forward a distance determined by the angle of the cam-groove, and the forward inclined face of the wedge-piece b at the same time forces the advance pawl-block by its tongue forward. With the tongues then swung into and occupying positions in the cam grooves of the knee, as shown in Fig. 8, on a tilt of the bar D in the opposite direction, as indicated by the arrow a5, the tongue of the forward block is moved with its forward edge against the forward edge, c?, of the advance cam-groove a similar distance as before, and at the same time the rear edge of the rear inclined cam-slot acts upon the tongue of the rear pawl-block to again carry it forward into the position in relation to the cam-slot as seen in Fig. l, and so on for each oscillation of the rocker-bar, the rear and forward pawl-carrying blocks alternately operating on the camgrooved knee to force the same forward, it being understood that the pawls, when set with their rear ends for engagement, permit of a forward movement of the carryingblocks when the inclined edges of the cam-grooves exert a pressure thereon in a forward direction, but that any backward movement of or by such blocks is prevented by said so-adjusted pawls. On the other hand, on an adjustment of the pawls through the tilting bar F to engage by their forward ends, je', with the rack, on an oscillation of the bar D, as before described, the blocks and knee will be moved backward step by step, any forward movement thereof being prevented by the said pawls adjusted as last described; and it will be seen that with con necting-bar g extending to the farther end of the carriage and connecting-with the rockershaft D of the farther head-block the shafts D D of both head-blocks may be similarly and simultaneously rocked to secure a travel of its respective knee, and it will also be seen that under certain adjustments vof the pawls, as desired, the knees may be caused to move forward in unison, or that one only may be moved forward, the other remaining stationary, or that while the knee at one head-block is caused to move forward the knee at the other headu block may be moved backwardly, the advanas applicable in the sawing ofslab sides, tapeiing boards or planks, andthe turning or rolling of logs on the knees therefor.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination, with a suitably-guided part provided with angularlyarranged grooves a a, of a rocker-bar having a rack, blocks adapted to slide thereon, provided with projections engaging said grooves and having pawls adapted to engage said rack,and a means for oscillating said racked bar, substantially as and for the purpose described.

2. The combination, with a suitably-guided part provided with angularly-arranged grooves aY a, of a suitably-journaled rocker-bar having arack and provided with a crank-arm, alever and connection between said crank-arm and lever, and blocks adapted to slide on said rocker-bar, provided with projections engaging said grooves and having pawls, substantially as and for the purpose described.

3. -'The combination, with a suitablyguided part provided with angularly-arranged grooves a a, of a rocker -bar having a rack, blocks adapted to slide thereon, provided with projections engaging said grooves, and having pawls pivoted therein and adapted to engage said rack-teeth, a tilting bar journaled on said rocker-shaft and bearing on said pawls, and means for securing an oscillation of said bar, substantially as andfor the purpose described.

4. The combination, with ahead-block knee provided with angularly-arranged grooves a a, of a suitably-journaled rocker-bar, D, having a rack and provided with crankarm g2, a bar, F, journaled on said rocker shaft, provided with acrank-arm, m, blocksE E, adapted to slide on said rocker-bar, provided with projections h, engaging said grooves and having pawls j j, pivoted levers 97 and m3, and connections between said levers and said crankarms g2 and m, respectively, all substantially as and for the purpose described.

5. The combination,with ahead-block knee providedwith angularly-arranged cam-grooves a a, of a rockerbar having a rack, the bar F, journaled thereon, the blocks E E, adapted to slide on saidl bar and provided with projections h, engaging said grooves, double-nosed pawls pivoted in said blocks, and means for` oscillating said bar F, substantially as and for the purpose described.

6. The combination,with a head-block knee provided with the triangular-shaped block I), having a slot, b, and set-screw, and the angularly-arranged strips d d, of a rocker-bar having a rack, blocks E E, adapted to slide on said bar, provided with projections engaging said grooves, pawls adapted to engage said rack, and means for oscillating said rockerbar, substantially as and for the purpose described.

7. In a head-block for a saw-mill, the combination, with the cross-bar B and the knee C,

IOO

IIO

adapted to slide thereon, provided with angularly-arranged grooves a a, 'of a rocker-bar having a rack, blocks E E, adapted to slide on said bar, provided with projections engaging said grooves and pawls adapted to engage said rack, and means for oscillating said rocker-bar, substantially as and for the purpose described. t

8. In combination, two head-blocls, each comprising the cross-bar B, the k nee C, adapted to slide on said bar B, provided with augularly-arranged grooves a a, the racked rockerbar D, blocks E E, adapted to slide on said bar D, provided with projections engaging said grooves and having paWls adapted to engage said rack teeth, a connection between the rocker-bars,and a means for securing its reciprocation, substantially as and for the purpose described IRWIN SWANK.

Witnesses:

LoUIs T. DUNN, GEORGE W. WOODRUFF. 

